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"Having reviewed the 'Moonshadow' episode of 'This Is Us,' the Awards Committee noted that the entrant unfortunately miscalculated the proportion of scenes that were period versus contemporary," a Television Academy spokesman said in a statement to CNN. "In fact, the episode is predominately period. The entry (and subsequent nomination) are thereby disqualified."

According to Emmy rules, at least 51% of an episode's costumes must be in a setting that takes place within the last 25 years to be eligible.

Other shows nominated in the category include "Big Little Lies," "Empire," "Grace and Frankie" and "Transparent."

The Television Academy said the "sixth-place vote-getter -- now the fifth nomination -- will be identified by the accountants and will be revealed next week.